#ifndef __M_SERVRE_H__
#define __M_SERVRE_H__

#include "Data.hpp"
#include "httplib.h"

extern cloud::DataManager *_data;

namespace cloud
{
    class Server
    {
    private:
        int _server_port;
        std::string _server_ip;
        std::string _download_prefix;
        httplib::Server _server;

    private:
        static void Upload(const httplib::Request &req, httplib::Response &rsp)
        {
                // std::cout<<"Upload ok......\n";

            // post/upload  文件实际在正文中（正文并没有全文数据）
            auto ret = req.has_file("file");
            if (ret == false)
            {
                rsp.status = 400;
                return;
            }
            const auto &file = req.get_file_value("file");
            // file.filename//文件名 file.connet//文件数据
            std::string back_dir = Config::GetInstance()->GetBackDir();
            std::string realpath = back_dir + FileUtil(file.name).FileName();
            FileUtil fu(realpath);
            // 将数据写入文件中
            fu.SetContent(file.content);

            BackupInfo info;
            // 组织备份的文件信息
            info.NewBackupInfo(realpath);
            // 向数据管理添加备份消息
            _data->Insert(info);
            return;
        }
        static std::string TimetoStr(time_t t)
        {
            std::string tmp = std::ctime(&t);
            return tmp;
        }
        static void ListShow(const httplib::Request &req, httplib::Response &rsp)
        {
            // 获取所有文件的备份信息
            std::vector<BackupInfo> arry;
            _data->GetAll(&arry);
            // 根据所有信息，组织html文件数据
            std::stringstream ss;
            ss << "<html><head><title>Download</title></head>";
            ss << "<body><h1>Download</h1><table>";
            for (auto &a : arry)
            {
                ss << "<tr>";
                std::string filename = FileUtil(a.real_path).FileName();
                ss << "<td><a href='" << a.url << "'>" << filename << "</a></td>";
                ss << "<td align='right'>" << TimetoStr(a.mtime) << "</td>";
                ss << "<td align='right'>" << a.fsize / 1024 << "k</td>";
                ss << "</tr>";
            }
            ss << "</table></body></html>";
            rsp.body = ss.str();
            rsp.set_header("Content-Type", "text/html");
            rsp.status = 200;
            return;
        }
        static std::string GetETag(const BackupInfo &info)
        {
            // etg :  filename-fsize-mtime
            FileUtil fu(info.real_path);
            std::string etag = fu.FileName();
            etag += "-";
            etag += std::to_string(info.fsize);
            etag += "-";
            etag += std::to_string(info.mtime);
            return etag;
        }
        static void DownLoad(const httplib::Request &req, httplib::Response &rsp)
        {
            // 1. 获取客户端请求的资源路径path   req.path
            // 2. 根据资源路径，获取文件备份信息
            BackupInfo info;
            _data->GetOneByURL(req.path, &info);
            // 3. 判断文件是否被压缩，如果被压缩，要先解压缩,
            if (info.pack_flag == true)
            {
                FileUtil fu(info.pack_path);
                fu.UnCompress(info.real_path); // 将文件解压到备份目录下
                // 4. 删除压缩包，修改备份信息（已经没有被压缩）
                fu.Remove();
                info.pack_flag = false;
                _data->Update(info);
            }

            bool retrans = false;
            std::string old_etag;
            if (req.has_header("If-Range"))
            {
                old_etag = req.get_header_value("If-Range");
                // 有If-Range字段且，这个字段的值与请求文件的最新etag一致则符合断点续传
                if (old_etag == GetETag(info))
                {
                    retrans = true;
                }
            }

            // 4. 读取文件数据，放入rsp.body中
            FileUtil fu(info.real_path);
            if (retrans == false)
            {
                fu.GetContent(&rsp.body);
                // 5. 设置响应头部字段： ETag， Accept-Ranges: bytes
                rsp.set_header("Accept-Ranges", "bytes");
                rsp.set_header("ETag", GetETag(info));
                rsp.set_header("Content-Type", "application/octet-stream");
                rsp.status = 200;
            }
            else
            {
                // httplib内部实现了对于区间请求也就是断点续传请求的处理
                // 只需要我们用户将文件所有数据读取到rsp.body中，它内部会自动根据请求
                // 区间，从body中取出指定区间数据进行响应
                //  std::string  range = req.get_header_val("Range"); bytes=start-end
                fu.GetContent(&rsp.body);
                rsp.set_header("Accept-Ranges", "bytes");
                rsp.set_header("ETag", GetETag(info));
                rsp.set_header("Content-Type", "application/octet-stream");
                // rsp.set_header("Content-Range", "bytes start-end/fsize");
                rsp.status = 206; // 区间请求响应的是206*****
            }
        }

        public:
            Server()
            {
                Config *config = Config::GetInstance();
                _server_ip = config->GetServerIp();
                // _server_ip = "0.0.0.0";//必须使用0.0.0.0
                
                _server_port = config->GetServerPort();
                _download_prefix = config->GetDownloadPrefix();
            }

            bool RunModule()
            {
                _server.Post("/upload", Upload);
                // std::cout<<"/upload ok\n";

                _server.Get("/listshow", ListShow);
                // std::cout<<"/listshow ok\n";

                _server.Get("/", ListShow);
                // std::cout<<"/ ok\n";


                std::string download_url = _download_prefix + "(.*)";
                _server.Get(download_url, DownLoad);
                // std::cout<<"download_url ok\n";

                _server.listen(_server_ip.c_str(), _server_port);
                // std::cout<<"_server_ip ok\n";
                
                return true;
            }
        };
    }

#endif //__M_SERVRE_H__